Logical Synchronizer Upgrades 76 Milestone 3: Production Readiness & Release

Milestone 3: Production Readiness & Release

| Estimated Delivery | Month 4 | | :---- | :---- | | Focus | Crash recovery, unhappy paths, and security hardening. |

Deliverables:

• Crash Recovery: Mechanisms to resume migration if a node restarts mid-process.
• Unhappy Paths: Handling late-coming Validators (offline during migration) via auto-catchup or repair workflows.
• Security Audit: Verification of time monotonicity, signature validity, and deduplication across the boundary.
• Final Release: Merged code into the main branch and included in a tagged Canton release.

_Originally posted by @pedrodneves in https://github.com/canton-foundation/canton-dev-fund/issues/76#issuecomment-4306168410_